Answer:
$7.5
Step-by-step explanation:
if we set up the proportion with cost on top and water bottles on bottom, we can divide 10/4 too get 2.5, which we can then multiply by 3 to get our x value, 7.5.
x=6
U.S. Currency
6 years
let x = # of years
6 + 2x = 12 + x
x = 6
